| Nurse practitioner | 580 |
| Internal medicine | 210 |
| Physician assistant | 175 |
| Family practice | 141 |
| Emergency medicine | 114 |
| Certified Registered Nurse Anesthetist (CRNA) | 95 |
| General practice | 79 |
| Anesthesiology | 67 |
| Physical therapist (private practice) | 65 |
| Diagnostic Radiology | 64 |
| Obstetrics/gynecology | 61 |
| Optometrist | 58 |
| Mental Health Counselors | 57 |
| Licensed clinical social worker | 53 |
| Centralized Flu | 50 |
| General surgery | 49 |
| Chiropractic | 47 |
| Psychiatry | 38 |
| Orthopedic surgery | 37 |
| Hospitalist | 34 |
| Ophthalmology | 32 |
| Podiatry | 32 |
| Neurology | 31 |
| Mass Immunization Roster Billers | 31 |
| Cardiology | 26 |
| Clinical psychologist | 23 |
| Pulmonary disease | 22 |
| Gastroenterology | 22 |
| Occupational therapist (private practice) | 21 |
| Critical care (intensivists) | 20 |
| Urology | 19 |
| Audiologist (billing independently) | 18 |
| Dermatology | 17 |
| Pediatric medicine | 16 |
| Infectious disease | 16 |
| Otolaryngology | 15 |
| Physical medicine and rehabilitation | 14 |
| Nephrology | 14 |
| Pathology | 13 |
| Pharmacy | 11 |
| Rheumatology | 11 |
| Endocrinology | 10 |
| Speech / language pathology | 10 |
| Ambulatory Surgical Center | 10 |
| Certified nurse midwife | 10 |
| Interventional Pain Management (IPM) | 9 |
| Pain Management | 9 |
| Vascular surgery | 8 |
| Radiation oncology | 8 |
| Neurosurgery | 7 |
| Interventional Cardiology | 7 |
| Hematology/oncology | 7 |
| Thoracic surgery | 6 |
| Interventional radiology | 6 |
| Anesthesiologist Assistant | 6 |
| Surgical oncology | 5 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 5 |
| Hand surgery | 4 |
| Medical oncology | 4 |
| Sports Medicine | 4 |
| Gynecologist/oncologist | 4 |
| Micrographic Dermatologic Surgery | 4 |
| Allergy/immunology | 3 |
| Cardiac Electrophysiology | 3 |
| Plastic and reconstructive surgery | 3 |
| Registered Dietician/Nutrition Professional | 3 |
| Cardiac surgery | 2 |
| Marriage and Family Therapist | 2 |
| Independent Diagnostic Testing Facility (IDTF) | 2 |
| Clinical Laboratory (Billing Independently) | 2 |
| Osteopathic manipulative therapy | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Hematology | 1 |
| Psychologist (billing independently) | 1 |
| Opioid Treatment Program | 1 |
| Geriatric medicine | 1 |